Tripp Lite's AVRX550U Ultra-Compact Line Interactive UPS offers complete power protection for desktop PCs, network workstations and a wide variety of professional and consumer electronic devices. Uninterruptible Power Supply / UPS circuits switch to battery backup mode within milliseconds to keep connected equipment running without interruption or data loss during power failures. Automatic Voltage Regulation / AVR power conditioning maintains smooth, continuous operation of connected equipment during brownouts and overvoltages. Surge-only outlets offer convenient protection for printers and other desktop accessories not requiring battery support. AC and dataline surge suppression prevents connected equipment damage. USB communications port supports built-in power management and auto-shutdown features of Windows and Mac OS X or full featured monitoring and data-saving auto-shutdown options using Tripp Lite's free PowerAlert monitoring software. Features: AVRX550U ultra-compact 230V line interactive UPS offers complete AC power protection from blackouts, brownouts and transient surges 550VA / 300 watt UPS output capacity Uninterruptible Power Supply / UPS operation maintains battery-derived AC output during blackouts to prevent data loss and system downtime for connected equipment Built-in USB port enables data-saving unattended shutdown when used with Tripp Lite's PowerAlert software, available via FREE HID-compliant USB port also enables integration with built-in power management and auto shutdown features of Windows and Mac OS X Automatic Voltage Regulation / AVR corrects extended brownouts and overvoltages from 159 to 282V, without using battery power 5.1 minutes runtime at 50% load (150 watts) Up to 10 minutes runtime for a small desktop computer system consuming 80 watts continuous 6 total C13 outlets; Includes two 2m C13 to C14 power cables 3 UPS battery backup outlets, plus 3 additional surge-only outlets